The relationships of cartilaginous fishes: an immunological study of serum transferrins of holocephalans and elasmobranchs
Article first published online: 20 AUG 2009
Journal of Zoology
Volume 203, Issue 3, pages 303–310, July 1984
How to Cite
Burch, S. J., Lawson, R. and Davies, D. H. (1984), The relationships of cartilaginous fishes: an immunological study of serum transferrins of holocephalans and elasmobranchs. Journal of Zoology, 203: 303–310. doi: 10.1111/j.1469-7998.1984.tb02334.x
- Issue published online: 20 AUG 2009
- Article first published online: 20 AUG 2009
- Accepted 20 September 1983
Serum transferrins from two holocephalan, five elasmobranch and three teleost species have been compared using quantitative microcomplement fixation. Calculated immunological distances emphasize the close relationship between the holocephalans and elasmobranchs and strongly support the view that they should be considered as part of a natural assemblage which is widely separated from the teleosts.
If the Holocephali and elasmobranchs have been separate since the beginning of the Carboniferous, this implies that transferrin has evolved at a rate approximating to 0-15-0-26 immunological units per million years involving some 9–15% substitution of amino acids. These values are extremely low and indicate that holocephalan and elasmobranch transferrins have evolved some 2–3–7 times more slowly than those known from any other group of vertebrates.